/*
 * heatmap.js v2.0.0 | JavaScript Heatmap Library
 *
 * Copyright 2008-2014 Patrick Wied <heatmapjs@patrick-wied.at> - All rights reserved.
 * Dual licensed under MIT and Beerware license
 *
 * :: 2015-07-19 15:42
 */
// (function (name, context, factory) {
//   // Supports UMD. AMD, CommonJS/Node.js and browser context
//   if (typeof module !== "undefined" && module.exports) {
//     module.exports = factory();
//   }
//   // else if (typeof define === "function" && define.amd) {
//   //   define(factory);
//   // }
//   else {
//     context[name] = factory();
//   }
// })("h337", this, function () {
// Heatmap Config stores default values and will be merged with instance config
var HeatmapConfig = {
  defaultRadius: 40,
  defaultRenderer: "canvas2d",
  defaultGradient: {
    0.25: "rgb(0,0,255)",
    0.55: "rgb(0,255,0)",
    0.85: "yellow",
    1.0: "rgb(255,0,0)",
  },
  defaultMaxOpacity: 1,
  defaultMinOpacity: 0,
  defaultBlur: 0.85,
  defaultXField: "x",
  defaultYField: "y",
  defaultValueField: "value",
  plugins: {},
};
var Store = (function StoreClosure() {
  var Store = function Store(config) {
    this._coordinator = {};
    this._data = [];
    this._radi = [];
    this._min = 0;
    this._max = 1;
    this._xField = config["xField"] || config.defaultXField;
    this._yField = config["yField"] || config.defaultYField;
    this._valueField = config["valueField"] || config.defaultValueField;

    if (config["radius"]) {
      this._cfgRadius = config["radius"];
    }
  };

  var defaultRadius = HeatmapConfig.defaultRadius;

  Store.prototype = {
    // when forceRender = false -> called from setData, omits renderall event
    _organiseData: function (dataPoint, forceRender) {
      var x = dataPoint[this._xField];
      var y = dataPoint[this._yField];
      var radi = this._radi;
      var store = this._data;
      var max = this._max;
      var min = this._min;
      var value = dataPoint[this._valueField] || 1;
      var radius = dataPoint.radius || this._cfgRadius || defaultRadius;

      if (!store[x]) {
        store[x] = [];
        radi[x] = [];
      }

      if (!store[x][y]) {
        store[x][y] = value;
        radi[x][y] = radius;
      } else {
        store[x][y] += value;
      }

      if (store[x][y] > max) {
        if (!forceRender) {
          this._max = store[x][y];
        } else {
          this.setDataMax(store[x][y]);
        }
        return false;
      } else {
        return {
          x: x,
          y: y,
          value: value,
          radius: radius,
          min: min,
          max: max,
        };
      }
    },
    _unOrganizeData: function () {
      var unorganizedData = [];
      var data = this._data;
      var radi = this._radi;

      for (var x in data) {
        for (var y in data[x]) {
          unorganizedData.push({
            x: x,
            y: y,
            radius: radi[x][y],
            value: data[x][y],
          });
        }
      }
      return {
        min: this._min,
        max: this._max,
        data: unorganizedData,
      };
    },
    _onExtremaChange: function () {
      this._coordinator.emit("extremachange", {
        min: this._min,
        max: this._max,
      });
    },
    addData: function () {
      if (arguments[0].length > 0) {
        var dataArr = arguments[0];
        var dataLen = dataArr.length;
        while (dataLen--) {
          this.addData.call(this, dataArr[dataLen]);
        }
      } else {
        // add to store
        var organisedEntry = this._organiseData(arguments[0], true);
        if (organisedEntry) {
          this._coordinator.emit("renderpartial", {
            min: this._min,
            max: this._max,
            data: [organisedEntry],
          });
        }
      }
      return this;
    },
    setData: function (data) {
      var dataPoints = data.data;
      var pointsLen = dataPoints.length;

      // reset data arrays
      this._data = [];
      this._radi = [];

      for (var i = 0; i < pointsLen; i++) {
        this._organiseData(dataPoints[i], false);
      }
      this._max = data.max;
      this._min = data.min || 0;

      this._onExtremaChange();
      this._coordinator.emit("renderall", this._getInternalData());
      return this;
    },
    removeData: function () {
      // TODO: implement
    },
    setDataMax: function (max) {
      this._max = max;
      this._onExtremaChange();
      this._coordinator.emit("renderall", this._getInternalData());
      return this;
    },
    setDataMin: function (min) {
      this._min = min;
      this._onExtremaChange();
      this._coordinator.emit("renderall", this._getInternalData());
      return this;
    },
    setCoordinator: function (coordinator) {
      this._coordinator = coordinator;
    },
    _getInternalData: function () {
      return {
        max: this._max,
        min: this._min,
        data: this._data,
        radi: this._radi,
      };
    },
    getData: function () {
      return this._unOrganizeData();
    } /*,

      TODO: rethink.

    getValueAt: function(point) {
      var value;
      var radius = 100;
      var x = point.x;
      var y = point.y;
      var data = this._data;

      if (data[x] && data[x][y]) {
        return data[x][y];
      } else {
        var values = [];
        // radial search for datapoints based on default radius
        for(var distance = 1; distance < radius; distance++) {
          var neighbors = distance * 2 +1;
          var startX = x - distance;
          var startY = y - distance;

          for(var i = 0; i < neighbors; i++) {
            for (var o = 0; o < neighbors; o++) {
              if ((i == 0 || i == neighbors-1) || (o == 0 || o == neighbors-1)) {
                if (data[startY+i] && data[startY+i][startX+o]) {
                  values.push(data[startY+i][startX+o]);
                }
              } else {
                continue;
              } 
            }
          }
        }
        if (values.length > 0) {
          return Math.max.apply(Math, values);
        }
      }
      return false;
    }*/,
  };

  return Store;
})();

var Canvas2dRenderer = (function Canvas2dRendererClosure() {
  var _getColorPalette = function (config) {
    var gradientConfig = config.gradient || config.defaultGradient;
    var paletteCanvas = document.createElement("canvas");
    var paletteCtx = paletteCanvas.getContext("2d");

    paletteCanvas.width = 256;
    paletteCanvas.height = 1;

    var gradient = paletteCtx.createLinearGradient(0, 0, 256, 1);
    for (var key in gradientConfig) {
      gradient.addColorStop(key, gradientConfig[key]);
    }

    paletteCtx.fillStyle = gradient;
    paletteCtx.fillRect(0, 0, 256, 1);

    return paletteCtx.getImageData(0, 0, 256, 1).data;
  };

  var _getPointTemplate = function (radius, blurFactor) {
    var tplCanvas = document.createElement("canvas");
    var tplCtx = tplCanvas.getContext("2d");
    var x = radius;
    var y = radius;
    tplCanvas.width = tplCanvas.height = radius * 2;

    if (blurFactor == 1) {
      tplCtx.beginPath();
      tplCtx.arc(x, y, radius, 0, 2 * Math.PI, false);
      tplCtx.fillStyle = "rgba(0,0,0,1)";
      tplCtx.fill();
    } else {
      var gradient = tplCtx.createRadialGradient(
        x,
        y,
        radius * blurFactor,
        x,
        y,
        radius
      );
      gradient.addColorStop(0, "rgba(0,0,0,1)");
      gradient.addColorStop(1, "rgba(0,0,0,0)");
      tplCtx.fillStyle = gradient;
      tplCtx.fillRect(0, 0, 2 * radius, 2 * radius);
    }

    return tplCanvas;
  };

  var _prepareData = function (data) {
    var renderData = [];
    var min = data.min;
    var max = data.max;
    var radi = data.radi;
    var data = data.data;

    var xValues = Object.keys(data);
    var xValuesLen = xValues.length;

    while (xValuesLen--) {
      var xValue = xValues[xValuesLen];
      var yValues = Object.keys(data[xValue]);
      var yValuesLen = yValues.length;
      while (yValuesLen--) {
        var yValue = yValues[yValuesLen];
        var value = data[xValue][yValue];
        var radius = radi[xValue][yValue];
        renderData.push({
          x: xValue,
          y: yValue,
          value: value,
          radius: radius,
        });
      }
    }

    return {
      min: min,
      max: max,
      data: renderData,
    };
  };

  function Canvas2dRenderer(config) {
    var container = config.container;
    var shadowCanvas = (this.shadowCanvas = document.createElement("canvas"));
    var canvas = (this.canvas =
      config.canvas || document.createElement("canvas"));
    var renderBoundaries = (this._renderBoundaries = [10000, 10000, 0, 0]);

    var computed = getComputedStyle(config.container) || {};

    canvas.className = "heatmap-canvas";

    this._width =
      canvas.width =
      shadowCanvas.width =
        +computed.width.replace(/px/, "");
    this._height =
      canvas.height =
      shadowCanvas.height =
        +computed.height.replace(/px/, "");

    this.shadowCtx = shadowCanvas.getContext("2d");
    this.ctx = canvas.getContext("2d");

    // @TODO:
    // conditional wrapper

    canvas.style.cssText = shadowCanvas.style.cssText =
      "position:absolute;left:0;top:0;";

    container.style.position = "relative";
    container.appendChild(canvas);

    this._palette = _getColorPalette(config);
    this._templates = {};

    this._setStyles(config);
  }

  Canvas2dRenderer.prototype = {
    renderPartial: function (data) {
      this._drawAlpha(data);
      this._colorize();
    },
    renderAll: function (data) {
      // reset render boundaries
      this._clear();
      this._drawAlpha(_prepareData(data));
      this._colorize();
    },
    _updateGradient: function (config) {
      this._palette = _getColorPalette(config);
    },
    updateConfig: function (config) {
      if (config["gradient"]) {
        this._updateGradient(config);
      }
      this._setStyles(config);
    },
    setDimensions: function (width, height) {
      this._width = width;
      this._height = height;
      this.canvas.width = this.shadowCanvas.width = width;
      this.canvas.height = this.shadowCanvas.height = height;
    },
    _clear: function () {
      this.shadowCtx.clearRect(0, 0, this._width, this._height);
      this.ctx.clearRect(0, 0, this._width, this._height);
    },
    _setStyles: function (config) {
      this._blur = config.blur == 0 ? 0 : config.blur || config.defaultBlur;

      if (config.backgroundColor) {
        this.canvas.style.backgroundColor = config.backgroundColor;
      }

      this._opacity = (config.opacity || 0) * 255;
      this._maxOpacity = (config.maxOpacity || config.defaultMaxOpacity) * 255;
      this._minOpacity = (config.minOpacity || config.defaultMinOpacity) * 255;
      this._useGradientOpacity = !!config.useGradientOpacity;
    },
    _drawAlpha: function (data) {
      var min = (this._min = data.min);
      var max = (this._max = data.max);
      var data = data.data || [];
      var dataLen = data.length;
      // on a point basis?
      var blur = 1 - this._blur;

      while (dataLen--) {
        var point = data[dataLen];

        var x = point.x;
        var y = point.y;
        var radius = point.radius;
        // if value is bigger than max
        // use max as value
        var value = Math.min(point.value, max);
        var rectX = x - radius;
        var rectY = y - radius;
        var shadowCtx = this.shadowCtx;

        var tpl;
        if (!this._templates[radius]) {
          this._templates[radius] = tpl = _getPointTemplate(radius, blur);
        } else {
          tpl = this._templates[radius];
        }
        // value from minimum / value range
        // => [0, 1]
        shadowCtx.globalAlpha = (value - min) / (max - min);

        shadowCtx.drawImage(tpl, rectX, rectY);

        // update renderBoundaries
        if (rectX < this._renderBoundaries[0]) {
          this._renderBoundaries[0] = rectX;
        }
        if (rectY < this._renderBoundaries[1]) {
          this._renderBoundaries[1] = rectY;
        }
        if (rectX + 2 * radius > this._renderBoundaries[2]) {
          this._renderBoundaries[2] = rectX + 2 * radius;
        }
        if (rectY + 2 * radius > this._renderBoundaries[3]) {
          this._renderBoundaries[3] = rectY + 2 * radius;
        }
      }
    },
    _colorize: function () {
      var x = this._renderBoundaries[0];
      var y = this._renderBoundaries[1];
      var width = this._renderBoundaries[2] - x;
      var height = this._renderBoundaries[3] - y;
      var maxWidth = this._width;
      var maxHeight = this._height;
      var opacity = this._opacity;
      var maxOpacity = this._maxOpacity;
      var minOpacity = this._minOpacity;
      var useGradientOpacity = this._useGradientOpacity;

      if (x < 0) {
        x = 0;
      }
      if (y < 0) {
        y = 0;
      }
      if (x + width > maxWidth) {
        width = maxWidth - x;
      }
      if (y + height > maxHeight) {
        height = maxHeight - y;
      }

      var img = this.shadowCtx.getImageData(x, y, width, height);
      var imgData = img.data;
      var len = imgData.length;
      var palette = this._palette;

      for (var i = 3; i < len; i += 4) {
        var alpha = imgData[i];
        var offset = alpha * 4;

        if (!offset) {
          continue;
        }

        var finalAlpha;
        if (opacity > 0) {
          finalAlpha = opacity;
        } else {
          if (alpha < maxOpacity) {
            if (alpha < minOpacity) {
              finalAlpha = minOpacity;
            } else {
              finalAlpha = alpha;
            }
          } else {
            finalAlpha = maxOpacity;
          }
        }

        imgData[i - 3] = palette[offset];
        imgData[i - 2] = palette[offset + 1];
        imgData[i - 1] = palette[offset + 2];
        imgData[i] = useGradientOpacity ? palette[offset + 3] : finalAlpha;
      }
      Object.defineProperty(img, "data", {
        value: imgData,
        writable: true,
        configurable: true,
        enumerable: true,
      });
      // img.data = imgData;
      this.ctx.putImageData(img, x, y);

      this._renderBoundaries = [1000, 1000, 0, 0];
    },
    getValueAt: function (point) {
      var value;
      var shadowCtx = this.shadowCtx;
      var img = shadowCtx.getImageData(point.x, point.y, 1, 1);
      var data = img.data[3];
      var max = this._max;
      var min = this._min;

      value = (Math.abs(max - min) * (data / 255)) >> 0;

      return value;
    },
    getDataURL: function () {
      return this.canvas.toDataURL();
    },
  };

  return Canvas2dRenderer;
})();

var Renderer = (function RendererClosure() {
  var rendererFn = false;

  if (HeatmapConfig["defaultRenderer"] === "canvas2d") {
    rendererFn = Canvas2dRenderer;
  }

  return rendererFn;
})();

var Util = {
  merge: function () {
    var merged = {};
    var argsLen = arguments.length;
    for (var i = 0; i < argsLen; i++) {
      var obj = arguments[i];
      for (var key in obj) {
        merged[key] = obj[key];
      }
    }
    return merged;
  },
};
// Heatmap Constructor
var Heatmap = (function HeatmapClosure() {
  var Coordinator = (function CoordinatorClosure() {
    function Coordinator() {
      this.cStore = {};
    }

    Coordinator.prototype = {
      on: function (evtName, callback, scope) {
        var cStore = this.cStore;

        if (!cStore[evtName]) {
          cStore[evtName] = [];
        }
        cStore[evtName].push(function (data) {
          return callback.call(scope, data);
        });
      },
      emit: function (evtName, data) {
        var cStore = this.cStore;
        if (cStore[evtName]) {
          var len = cStore[evtName].length;
          for (var i = 0; i < len; i++) {
            var callback = cStore[evtName][i];
            callback(data);
          }
        }
      },
    };

    return Coordinator;
  })();

  var _connect = function (scope) {
    var renderer = scope._renderer;
    var coordinator = scope._coordinator;
    var store = scope._store;

    coordinator.on("renderpartial", renderer.renderPartial, renderer);
    coordinator.on("renderall", renderer.renderAll, renderer);
    coordinator.on("extremachange", function (data) {
      scope._config.onExtremaChange &&
        scope._config.onExtremaChange({
          min: data.min,
          max: data.max,
          gradient:
            scope._config["gradient"] || scope._config["defaultGradient"],
        });
    });
    store.setCoordinator(coordinator);
  };

  function Heatmap() {
    var config = (this._config = Util.merge(HeatmapConfig, arguments[0] || {}));
    this._coordinator = new Coordinator();
    if (config["plugin"]) {
      var pluginToLoad = config["plugin"];
      if (!HeatmapConfig.plugins[pluginToLoad]) {
        throw new Error(
          "Plugin '" +
            pluginToLoad +
            "' not found. Maybe it was not registered."
        );
      } else {
        var plugin = HeatmapConfig.plugins[pluginToLoad];
        // set plugin renderer and store
        this._renderer = new plugin.renderer(config);
        this._store = new plugin.store(config);
      }
    } else {
      this._renderer = new Renderer(config);
      this._store = new Store(config);
    }
    _connect(this);
  }

  // @TODO:
  // add API documentation
  Heatmap.prototype = {
    addData: function () {
      this._store.addData.apply(this._store, arguments);
      return this;
    },
    removeData: function () {
      this._store.removeData &&
        this._store.removeData.apply(this._store, arguments);
      return this;
    },
    setData: function () {
      this._store.setData.apply(this._store, arguments);
      return this;
    },
    setDataMax: function () {
      this._store.setDataMax.apply(this._store, arguments);
      return this;
    },
    setDataMin: function () {
      this._store.setDataMin.apply(this._store, arguments);
      return this;
    },
    configure: function (config) {
      this._config = Util.merge(this._config, config);
      this._renderer.updateConfig(this._config);
      this._coordinator.emit("renderall", this._store._getInternalData());
      return this;
    },
    repaint: function () {
      this._coordinator.emit("renderall", this._store._getInternalData());
      return this;
    },
    getData: function () {
      return this._store.getData();
    },
    getDataURL: function () {
      return this._renderer.getDataURL();
    },
    getValueAt: function (point) {
      if (this._store.getValueAt) {
        return this._store.getValueAt(point);
      } else if (this._renderer.getValueAt) {
        return this._renderer.getValueAt(point);
      } else {
        return null;
      }
    },
  };

  return Heatmap;
})();

// core
var heatmapFactory = {
  create: function (config) {
    return new Heatmap(config);
  },
  register: function (pluginKey, plugin) {
    HeatmapConfig.plugins[pluginKey] = plugin;
  },
};

// return heatmapFactory;
// });

export default heatmapFactory;
